Re: [xml] valgrind and xmlNewTextReaderFilename

[Rob Richards <rrichards cdatazone org>]

On 8/3/11 5:58 PM, Norman Lo wrote:
> Hi,
>
> I am trying to parse an XML file using xmlTextReader interface. 
> Consider the following short program:
>
> #include <libxml/xmlreader.h>
>
> int main(){
>   xmlTextReaderPtr reader;
>
>   reader = xmlNewTextReaderFilename("./Config Sample.xml");
>   xmlFreeTextReader(reader);
> }
>
>
> When I run it against valgrind, I got a bunch memory blocks still 
> reachable errors, some of these are listed below.
>
> Am I not using the right exit function to free the memory. Or is it 
> expected. I have tried the same program with v2.6.26 and v2.7.8.
>
> Thank you very much in advance.
>
> Norman
>
> ==24058==
> ==24058== 40 bytes in 1 blocks are still reachable in loss record 15 
> of 18
> ==24058==    at 0x4A06F0F: malloc (vg_replace_malloc.c:236)
> ==24058==    by 0x3119E2ED87: xmlNewCharEncodingHandler (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119E2EF3E: xmlInitCharEncodingHandlers (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119E2F24B: xmlGetCharEncodingHandler (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119E57EEA: xmlAllocParserInputBuffer (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119E5838B: __xmlParserInputBufferCreateFilename (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119ED7114: xmlNewTextReaderFilename (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x400609: main (test.c:6)
> ==24058==
> ==24058== 40 bytes in 1 blocks are still reachable in loss record 16 
> of 18
> ==24058==    at 0x4A06F0F: malloc (vg_replace_malloc.c:236)
> ==24058==    by 0x3119E2ED87: xmlNewCharEncodingHandler (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119E2EF53: xmlInitCharEncodingHandlers (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119E2F24B: xmlGetCharEncodingHandler (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119E57EEA: xmlAllocParserInputBuffer (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119E5838B: __xmlParserInputBufferCreateFilename (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119ED7114: xmlNewTextReaderFilename (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x400609: main (test.c:6)
> ==24058==
> ==24058== 104 bytes in 1 blocks are still reachable in loss record 17 
> of 18
> ==24058==    at 0x4A06F0F: malloc (vg_replace_malloc.c:236)
> ==24058==    by 0x3119E9A40C: xmlNewRMutex (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119EE7974: ??? (in /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119EE7B91: xmlDictCreate (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119E329DB: xmlInitParserCtxt (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119E32A4D: xmlNewParserCtxt (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119E4A035: xmlCreatePushParserCtxt (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119ED6CE1: xmlNewTextReader (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119ED7127: xmlNewTextReaderFilename (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x400609: main (test.c:6)
> ==24058==
> ==24058== 400 bytes in 1 blocks are still reachable in loss record 18 
> of 18
> ==24058==    at 0x4A06F0F: malloc (vg_replace_malloc.c:236)
> ==24058==    by 0x3119E2EE4A: xmlInitCharEncodingHandlers (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119E2F24B: xmlGetCharEncodingHandler (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119E57EEA: xmlAllocParserInputBuffer (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119E5838B: __xmlParserInputBufferCreateFilename (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x3119ED7114: xmlNewTextReaderFilename (in 
> /usr/lib64/libxml2.so.2.6.26)
> ==24058==    by 0x400609: main (test.c:6)
> ==24058==
> ==24058== LEAK SUMMARY:
> ==24058==    definitely lost: 0 bytes in 0 blocks
> ==24058==    indirectly lost: 0 bytes in 0 blocks
> ==24058==      possibly lost: 0 bytes in 0 blocks
> ==24058==    still reachable: 886 bytes in 18 blocks
> ==24058==         suppressed: 0 bytes in 0 blocks
> ==24058==
> ==24058== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 4 from 4)
> --24058--
> --24058-- used_suppression:      4 dl-hack3
> ==24058==
> ==24058== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 4 from 4)

http://xmlsoft.org/xmlmem.html
Read the section "Cleaning up after using the library"

Rob